Article
Energy & Fuels
Ji-Long Shi, Keyu Feng, Huimin Hao, Calvin Ku, Patrick H-L Sit, Wey Yang Teoh, Xianjun Lang
Summary: This study presents a method to enhance the photocatalytic performance of COFs using π-π stacking interactions, synthesizing a pyrene-tethered TEMPO derivative cocatalyst and immobilizing it in Por-sp(2)c-COF, which significantly improves the efficiency of photoinduced hole transfer and stability for selective oxidation reactions. The research highlights the merit of π-π stacking as a facile and efficient approach for immobilizing hole transfer cocatalysts in 2D COF photocatalysts without disrupting their physiochemical properties.
Article
Engineering, Chemical
Peiying Mo, Daijun Fu, Ping Chen, Qianxin Zhang, Xiaoshan Zheng, Jun Hao, Xiaoqin Zhuang, Haijin Liu, Guoguang Liu, Wenying Lv
Summary: In this study, two classes of ionic covalent organic frameworks (iCOFs) with different pore sizes were used as adsorbents for the removal of NSAIDs. The iCOFs showed strong affinity for DCF and KT, as well as good adsorption-desorption cycle performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Qianqian Yan, Shanshan Tao, Ruoyang Liu, Yongfeng Zhi, Donglin Jiang
Summary: Helicenes are fascinating chiral helical molecules with rich chemistry. Although research on synthesizing helicenes with increased numbers of aromatic rings and complex heterostructures has been conducted over the past century, the study of inorganic, organic, and polymeric helicene materials is still in its early stages.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Yingying Zhang, Miroslav Polozij, Thomas Heine
Summary: Research on the inherent disorder in the structure of layered COFs has led to discrepancies between experimental and predicted results, utilizing statistical models to better simulate experimental data, demonstrating the importance of the ABC stacking mode and solvent molecules in layered COFs.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Kaushik Naskar, Arka Dey, Suvendu Maity, Partha Pratim Ray, Chittaranjan Sinha
Summary: Two new families of electro-conductive 2D metal organic frameworks (MOFs) of Zn(II)/Cd(II) with different structural topologies and electron transport capabilities have been isolated and characterized. The larger Cd(II) cation size and stronger pi-pi stacking in sample 2 may contribute to its higher charge mobility compared to sample 1.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Multidisciplinary
Li Liao, Zerong Zhang, Xinyu Guan, Hui Li, Yaozu Liu, Minghao Zhang, Bin Tang, Valentin Valtchev, Yushan Yan, Shilun Qiu, Xiangdong Yao, Qianrong Fang
Summary: In this study, novel three-dimensional sp(2) carbon-linked COFs were synthesized through the formation reaction of C=C bonds and their application in fluorescence imaging was investigated. The results showed that these COFs exhibited high stability and excellent light-emitting properties, making them potential drug carriers and cell fluorescent stains.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Kuber Singh Rawat, Sander Borgmans, Tom Braeckevelt, Christian V. V. Stevens, Pascal Van Der Voort, Veronique Van Speybroeck
Summary: Two-dimensional nanoporous covalent organic frameworks (2D COFs) have attracted significant interest due to their wide range of applications. Understanding the layer stacking in 2D COFs and its effect on the structural and electronic properties is crucial. In this study, a detailed density functional theory investigation was carried out on four materials, revealing the optimal slipped AA-stacking configuration and the importance of considering dynamic fluctuations in accurately modeling the stacking configuration. The electronic band structure of COFs was found to be profoundly affected by different stacking configurations, with a decrease in layer offset leading to increased interlayer charge mobility.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Seokmin Kang, Heesu Ahn, Chanho Park, Won Hyeok Yun, Ju Gyeong Jeong, Yong Jin Lee, Dong Wook Kim
Summary: Organic nanomaterials as nanocarrier platforms were successfully prepared in the form of two-dimensional covalent organic nanosheets (CONs), which can serve as efficient in vivo bioimaging probes. The CONs were obtained by condensing 1,3,5-triformylglucinol (Tp) and 2,7-diaminopyrene (Py) to produce covalent organic frameworks (COFs), followed by a liquid exfoliation process. The CONs dispersed well in water, exhibited favorable photoluminescence properties, and showed low cytotoxicity. In vivo fluorescence imaging studies using tumor-bearing mice confirmed the persistent and strong fluorescence signals in the tumor region after intravenous injection of the CONs dispersed in phosphate-buffered saline (PBS), with low background signals from normal tissues.
Article
Nanoscience & Nanotechnology
Peng Gao, Xiaoying Shen, Xiaohan Liu, Bingjie Cui, Mengzhen Wang, Xiuyan Wan, Na Li, Bo Tang
Summary: Carbonization significantly enhances the fluorescence quenching efficiency and aqueous stability of nanoscale COFs, leading to the development of C-COF probes with promising applications in cell imaging and biomarker detection, as well as potential use in photothermal therapy.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Review
Chemistry, Physical
Lingjun Kong, Ming Liu, Hui Huang, Yunhua Xu, Xian-He Bu
Summary: Metal-organic frameworks (MOFs) and covalent-organic frameworks (COFs) are emerging families of functional materials with immense potential for high-performance electrode materials for metal-ion batteries. Despite their advantages, MOFs/COFs and their derivatives face challenges as cathode materials.
ADVANCED ENERGY MATERIALS
(2022)
Review
Chemistry, Inorganic & Nuclear
Pounraj Thanasekaran, Cing-Huei Su, Yen-Hsiang Liu, Kuang-Lieh Lu
Summary: The article highlights the importance of weak interactions in metal-organic frameworks (MOFs) and recent advancements in inducing high conductivity through through-bond and through-space strategies. By utilizing strong orbital overlap bonding and integrating metal-organic linkers within MOFs, conductivity can be induced in typically poor conductive MOFs. Additionally, weak interactions such as p-p stacking, donor-acceptor interactions, hydrogen bonding, and redox pathways play a crucial role in altering the conductivity of MOFs.
COORDINATION CHEMISTRY REVIEWS
(2021)
Review
Chemistry, Multidisciplinary
Dongyang Zhu, Guiyin Xu, Morgan Barnes, Yilin Li, Chia-Ping Tseng, Zhuqing Zhang, Jun-Jie Zhang, Yifan Zhu, Safiya Khalil, Muhammad M. Rahman, Rafael Verduzco, Pulickel M. Ajayan
Summary: COFs have emerged as a new class of porous materials constructed by organic building blocks via dynamic covalent bonds, which have been extensively explored as potentially superior candidates for electrode materials. Significant progress has been made in utilizing COFs for various battery applications, with particular attention to the structure and chemistry of COFs and novel strategies to enhance battery performance. Challenges, solutions, and future research directions on COFs for batteries have been discussed, laying the groundwork for future advances in this exciting material class.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Cong Du, Xuefeng Zhu, Chenchen Yang, Minghua Liu
Summary: This study successfully constructed chiral covalent organic frameworks with circularly polarized luminescence activity, demonstrating the importance of the reticular frame in CPL generation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Multidisciplinary
Ziman Chen, Xinle Li, Chongqing Yang, Kaipeng Cheng, Tianwei Tan, Yongqin Lv, Yi Liu
Summary: MOFs and COFs are two frontier crystalline porous framework materials, each with its own advantages and shortcomings for specific applications. However, combining the complementary properties of the two materials allows for the creation of new classes of hybrid porous crystalline materials with superior properties. The rapid evolution of MOF/COF hybrids since their first report in 2016 has led to diverse applications in various fields.
Article
Materials Science, Multidisciplinary
Yaqian Yan, Tian Xia, Yuxiang Zhao, Haochen Sun, Chaokun Li, Ruimei Fan, Wenxin Wang, Qi Chen
Summary: This study successfully synthesized a highly fluorescent 50% B-COF by changing the electron cloud distribution through the coordination of nitrogen and boron, enabling the transformation from a non-fluorescent compound to a fluorescent compound.
